lecture8

# lecture8 - Phys 2101 Gabriela Gonzlez p = mv Single...

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Phys 2101 Gabriela González Single particle: Several particles: v m p = d p dt = F net = m a ... 3 2 1 + + + = p p p P If F net =0, momentum is conserved d P dt = M a com = F ext

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Ricardo, mass 95 kg, and Carmelita, who is lighter, are enjoying Lake Merced at dusk in a 35 kg canoe. When the canoe is at rest in the placid water, they exchange seats, which are 3.0 m apart and symmetrically located with respect to the canoe's center. Ricardo notices that the canoe moved 40 cm relative to a submerged log during the exchange and calculates Carmelita's weight, which she has not told him. What is it? Ricardo, mass 95 kg, and Carmelita, who is lighter, are enjoying Lake Merced at dusk in a 35 kg canoe. When the canoe is at rest in the placid water, they exchange seats, which are 3.0 m apart and symmetrically located with respect to the canoe's center. Ricardo notices that the canoe moved 40 cm relative to a submerged log during the exchange and calculates Carmelita's weight, which she has not told him. What is it? R C B X com R C B X com 40 cm We know that the center of mass is 20cm from the center of the boat, closer to Ricardo. Choosing a coordinate system with the origin at the center of the boat in the original position, the coordinate of the center of mass is: x com = m R x R + m B x B + m C x C m R + m B + m C 0.2 m = 95 kg × ( 1.5 m ) + 30 kg × (0 m ) + m C (1.5 m ) 95 kg + 30 kg + m
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lecture8 - Phys 2101 Gabriela Gonzlez p = mv Single...

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